When was WWl, WW2, and WW3?

Question:

what are the dates and history of these 3 wars?

Answer:

WW3 - I missed it!! Unless you mean the Cold War. But seriously, let us pray that WW3 never happens.

WW1 1914 to 1818 for the actual fighting. the USA joined late, in 1917.

WW2 1939 to 1945 for the actual fighting by some countries; the USA and Russia and Japan joined late, 1941 and 1942. Some people consider the Japanese invasion of China in 1936 as the start.